The plastic extruder extrudes the molten plastic through a fixed shape of the extrusion inlet under the effect of the screw, and laser cuts it after being shaped by water-cooling heat dissipation under the action of the pay off machine. It is suitable for many continuous consumption and manufacturing of products with the same cross section, such as pipes, rods, pvc profiles, etc., and can also be used for granulation of plastic modification materials. Its plastic consumption processing is called extrusion forming process. The injection molding machine is used to inject molten plastic into the mold, and the product is produced after refrigeration. The main uses are very common, and the application locations are different according to different plastics. This process is called injection molding process.

There are also some differences between plastic extruders and injection molding machines in terms of consumption and processing information. The viscosity of raw materials is different. Injection molding process is that regular plastic raw materials can be moved in the mold, while the flow passage is generally bent and narrow, so the circulation of regular plastic raw materials must be good.

The injection molding machine is introduced into the closed mold core after the plastic particles are melted, and after the mold core is filled, the work is stopped first. After the plastic is cooled to a certain shape, the work is stopped again after the mold is released. Such as plastic cups, plastic pots and other plastic products. After melting the plastic particles, the plastic extruder stops extruding from time to time through the mold, such as plastic pipes, plastic plates, etc., and then stops disconnecting in the subsequent process. The two kinds of mechanical equipment not only consume different processing materials, but also have different screw structures.